The expression of CYP27B1 in ovarian tissues was detected using immunohistochemistry, as previously described (48 (link)). Briefly, formalin-fixed paraffin-embedded 4- to 5-μm sections were labeled overnight at 4°C with rabbit anti-CYP27B1 antibody (Santa Cruz Biotechnology, Santa Cruz, CA, USA) at a dilution of 1:75. The antigen-antibody binding was visualized with HRP-labeled anti-rabbit antibody and 3,3′-diaminobenzidine (DAB) (Envision System-HRP Labeled Polymer Anti-Mouse; Dako, Glostrup, Denmark), followed by hematoxylin counterstaining. The kidney sections served as positive control.
Furthermore, Ki67 immunostaining was performed as described previously (21 (link),49 (link),50 (link)).
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